The 6-10 outlook from the CPC indicates the cool start to Autumn experienced by many in the lower 48 will continue into the beginning of November. The above graphic is valid from Halloween through November 4th. The CPC is looking at temperatures below normal for much of the nation, with an excellent chance of below normal temperatures in the Upper Great Lakes and northern Plains regions.
Taking a look at the forecast from this morning’s GFS run, we can see the cooler air moving into the U.S.:
This forecast is valid the evening of November 1st. Obviously, a 7-day forecast has some degree of uncertainty, but the pattern of cooler air moving into the U.S. is what’s important to the CPC’s outlook. These 850 mb temperatures would likely yield surface temperatures topping out in the 40s – below the average temperature for this time of year. With above-average precipitation projected along the US/Canadian border, one might expect snowfall in this area during the time period.
Just something to think about as we head into the last week of October.